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From: Mikael Johansson <>
Subject: RAID-0 read perf. decrease after 2.4.20
Date: Thu, 20 Nov 2003 18:45:13 +0200 (EET)	[thread overview]
Message-ID: <> (raw)

Hello All!

Has anyone else experienced a drastic drop in read performance on software
RAID-0 with post 2.4.20 kernels? We have a few Athlon XP's here at our
lab with double IDE disks on different channels set up as RAID-0. Some
bonnie++ benchmark results with various kernels, on the same machine
(Athlon XP 2400+, 2 GHz, 1.5 GB RAM, VIA chipset, 2*Maxtor 120 GB
		write	read
2.4.20-ac1:	88,000 	135,000 K/sec
2.4.21-pre7:	93,000   75,000
2.4.22-ac4:	94,000	 82,000

So the write speed has gone up a bit, but the read speed performance has
plunged. Any ideas on what happened between 2.4.20 and 2.4.21 and what to
do about it? I'm eagerly awaiting suggestions, good read speed is quite
critical for many of our calculations :-) I will of course provide more
details if necessary.

Have a nice day,
    Mikael J.

             reply	other threads:[~2003-11-20 16:45 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-11-20 16:45 Mikael Johansson [this message]
2003-11-21 13:47 ` RAID-0 read perf. decrease after 2.4.20 Marcelo Tosatti
2003-11-21 19:56   ` Mikael Johansson
2003-12-08 12:47     ` Marcelo Tosatti
2003-12-08 13:11       ` Marc-Christian Petersen
2003-12-08 13:21         ` Marcelo Tosatti
2003-11-24 10:05 Martin Knoblauch
2003-11-25  5:01 ` Joshua Schmidlkofer
2003-11-25  9:41 Martin Knoblauch
2003-12-16 12:51 Martin Knoblauch
2003-12-18 13:41 ` Marcelo Tosatti
2003-12-18 14:37   ` Martin Knoblauch
2004-07-04 23:28     ` Mikael Johansson
2003-12-18 19:13   ` Mike Fedyk
2003-12-18 19:17     ` Marcelo Tosatti

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